Re: NSTs & PCBs?!?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Brian by way of Terry Fritz <teslalist-at-qwest-dot-net>" <ka1bbg-at-webryders-dot-net>

Hi, Ok it's time for me to kill the pcb/tar/asphault myth. Having been in
the Navy and worked with a 2500 gallon tank of the stuff for 3 years.
first the reason pcb is used is for electrical insulation medium for which
it works very well. If we add tar to pcb oil you would have a gooey mixture
loaded with carbon(a conductor of electricity) which would contaminate the
pcb and render its insulating properties useless! Peroid! as for any other
reason to add pcb to tar? there is none that i know of. I cannot discuss the
special equipment needed to keep the pcb free of contaminants
but that is what makes pcb a great insulator! cul brian f.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, March 06, 2003 10:18 PM
Subject: Re: NSTs & PCBs?!?


 > Original poster: "Steven Ward by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<srward16-at-hotmail-dot-com>
 >
 > Thats good to hear about the PCBs not have been used in NSTs.  I kinda
 > doubted it anyway, but thought i should ask.  Yeah, its tough to get the
 > old NSTs now.  And it seems to have drastically gotten worse in the last 2
 > months (around here anyway).  If they do sell them, they want like $60 for
 > a 12/60.  No way im paying that!  So i guess MOTs are looking good for the
 > future!  Time to work on that 4 pack!
 >
 > Steve Ward.
 >
 >
 >
 >
 >
 >
 > >From: "Tesla list" <tesla-at-pupman-dot-com>
 > >To: tesla-at-pupman-dot-com
 > >Subject: Re: NSTs & PCBs?!?
 > >Date: Thu, 06 Mar 2003 19:54:42 -0700
 > >
 > >Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>"
 > ><Neonglo-at-aol-dot-com>
 > >
 > >Hi Steve, All,
 > >
 > >As far as I know, neon transformers never contained PCBs (or tar for that
 > >matter) in the potting compound. The black potting material is a mixture
 > >of about 50% asphalt and 50% silica flour. This improves the electrical
 > >insulating ability of the asphalt, and also aids in heat transfer from
the
 > >core to the case. However, old high power factor transformers may contain

 > >a capacitor containing PCBs.
 > >
 > >It is now illegal for neon distributors to sell transformers without
 > >secondary ground fault circuit interrupters. This has upped the price of
 > >transformers and made them less reliable than the old ones. No wonder
sign
 > >shops have started to hang on to the good ol' standard neon transformers
 > >when they can.
 > >
 > >Tony
 > >
 > >*************************
 > >Tony Greer
 > >Special Effects Neon
 > >Lubbock, Texas
 > >*************************
 > >
 > >In a message dated 3/6/03 8:33:48 AM Central Standard Time,
 > >tesla-at-pupman-dot-com writes:
 > >
 > >>Hi,
 > >>
 > >>does anyone know if PCBs were ever used in the tar potting of old neon
 > >>transformers???  When i picked up some NSTs today, the man at the sign
shop
 > >>mentioned i probably should not try to depot them as there may be PCB in
 > >>the tar.  But now that i think about that, i would think they would have
to
 > >>use better methods of sealing off the case of the NST, if that were true
 > >>(but then again, they didnt really think PCBs were bad at the time of
its
 > >>use).
 > >>So to make sure, did the use PCB??  It makes me worry when i think of
all
 > >>the old transformers i unpotted!
 > >>
 > >>Steve Ward,
 > >>
 > >>PS, i hope im not setting off a false alarm. if so, sorry about that!
 > >>
 > >>PPS, is anyone else having a heck of a time getting NSTs???  The sign
shops
 > >>dont want to give up the old ones, and say that the price of new ones is
 > >>sky rocketing.
 > >
 > >
 > >
 > >
 > >
 >
 >
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